Tiestus was a 22nd century human colony planet. Capitol City was the planet's capital city. In 2114, Morris was its president.

In July 2114, Cybermen invaded Tiestus and attempted to convert its population. Humans were rounded up by the Cybermen and taken to a warehouse which had been adapted into a cyber-conversion factory. The invasion was stopped when Jacob Sowersby used his BOB implant to interfere with the cyberiad and overload the Cybermen with emotion. (PROSE: Status Update)

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